> On windows, if I have a png named .doc, then there is absolutely no way to determine that it is a valid png
And that's a good thing. Imagine receiving a file called "very_funny_cat.png" and Linux realizing that while it's not a valid PNG image, it is a valid ELF executable.
And that's a good thing. Imagine receiving a file called "very_funny_cat.png" and Linux realizing that while it's not a valid PNG image, it is a valid ELF executable.